Fitting linear models: an application of conjugate gradient algorithms.
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Fitting linear models: an application of conjugate gradient algorithms. by Allen Andrew McIntosh

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Published .
Written in English


Book details:

The Physical Object
Pagination185 leaves
Number of Pages185
ID Numbers
Open LibraryOL14706622M

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gradient algorithms to the linear model. Conjugate gradient algorithms have the advantage that the storage required to fit a p parameter model is of order p. Accordingly, they are well suited to the analysis of variance problems that are large relative to the amount of computer memory available. Under appropriate assumptions about balance, we will show that the number of iterations require to fit a model is.   To compare Algorithm with other similar algorithm, we also test the well-known PRP conjugate gradient algorithm, where the Step 5 of Algorithm is replaced by the PRP formula. The tested performances of these two algorithms (Algorithm and PRP algorithm) are listed and the spent time is stated in Table by: 1. Conjugate Gradient Solver. We now possess an easy-to-use class framework that completely abstracts the underlying hardware implementation, so we can easily write more-complex algorithms such as the conjugate gradient linear system solver. Using our implementation, the complete GPU conjugate gradient class appears in Listing The multilinear equations to be solved are specified as a large table of integer code values. The end user creates this table by using a small preprocessing program. For each different case, an individual structure table is needed. The solution is computed by using the conjugate gradient algorithm.

  The preconditioned conjugate gradient (PCG) algorithm is a well-known iterative method for solving sparse linear systems in scientific computations,. GPU-accelerated PCG algorithms for large-sized problems have attracted considerable attention recently. The algorithm employs a nonlinear conjugate gradients (NLCG) scheme to minimize an objective function that penalizes data residuals and second spatial derivatives of resistivity. The Algorithm of Gauss and Some of its Applications. Linear Operators in an n-dimensional Vector Space. The Rate of Convergence of the Conjugate Gradient Method. Y. Saad (). Gauss and Gauss--Jordan Methods. Matrix Analysis of Gauss's Method: The Cholesky and Doolittle Decompositions. The Linear Algebraic Model: The Method of.   You can do this when all data can easily fit into memory. We use linear regression here to demo gradient descent because it is an easy algorithm to understand. We might not use this algorithm to fit a linear regression if all data can fit into memory and we can use linalg methods instead.

Conjugate Gradients on the Normal Equations 41 The Nonlinear Conjugate Gradient Method 42 Outline of the Nonlinear Conjugate Gradient Method 42 General Line Search 43 Preconditioning 47 A Notes 48 B Canned Algorithms 49 B1. Steepest Descent 49 B2. Conjugate Gradients 50 B3. Preconditioned Conjugate Gradients 51 i.   Algorithms for Convex Optimization Book. The goal of this book is to enable a reader to gain an in-depth understanding of algorithms for convex optimization. The emphasis is to derive key algorithms for convex optimization from first principles and to establish precise running time bounds in terms of the input length. Since model derivatives are not involved, they are able to solve even very complex nonlinear problems, without the need of computing numerically unstable gradient and/or curvature information. Moreover, the linearization of the problem is not necessary since genetic algorithms are based only on direct model . The Nelder–Mead method (also downhill simplex method, amoeba method, or polytope method) is a commonly applied numerical method used to find the minimum or maximum of an objective function in a multidimensional space. It is a direct search method (based on function comparison) and is often applied to nonlinear optimization problems for which derivatives may not be known.